Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1573416 | Materials Science and Engineering: A | 2016 | 11 Pages |
Abstract
The hot deformation behavior of alloy 617 has been studied by performing hot compression in a range of temperatures (1173-1473Â K) and strain rates (0.001-10Â sâ1). The peak flow stress found to increase with Zener-Hollomon parameter (Z) following a hyperbolic-sine function relationship whereas peak strain followed power-law type relationship with Z. The average activation energy for the entire hot deformation domain was estimated to be 481Â kJÂ molâ1. The experimental stress-strain data has been used to develop processing map employing dynamic material model. The material exhibits a wide stable domain below 0.1Â sâ1 spanning over 1250-1473Â K, with a peak efficiency of ~45%. Based on the processing map and subsequent microstructural observation, the optimum hot deformation domain of alloy 617 is identified as 1323-1423Â K and 0.001-0.1Â sâ1. Furthermore, microstructural observation alone has revealed that a significant DRX with grain refinement could also be obtained at high temperature (>1373Â K) and high strain rate (>1Â sâ1) domain although processing map has marked this region as unstable domain.
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Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
K. Arun Babu, Sumantra Mandal, Abhishek Kumar, C.N. Athreya, B. de Boer, V. Subramanya Sarma,